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OpenSP: DTDs other than base allowed only if CONCUR YES or EXPLICIT YES

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Cause:

This eror can happens when 2 DTDs are declared in a page.

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Example:

Good

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
....

Good

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
<html>
....

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Solution:

Remove one of the declaration.

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References:

Retrieved from "http://www.htmlpedia.org/wiki/Sp_249"